JP4663476B2 - Measuring method of thickness of hydraulic iron pipe - Google Patents

Description

The present invention relates to a method for measuring the thickness of a hydraulic iron pipe for automatically measuring a reduction in thickness caused by aging deterioration of the hydraulic iron pipe used in a hydroelectric power plant.

Conventionally, hydraulic iron pipes used in hydroelectric power plants decrease in thickness and decrease in strength with age, but in order to calculate the pressure strength of hydraulic iron pipes with reduced thickness, the thickness of the hydraulic iron pipe is regularly measured. Is going. In this thickness measurement, after a measurement scaffold is built around the hydraulic iron pipe to be measured, the inspector uses a manual ultrasonic plate thickness gauge, for example, to measure the thickness of the hydraulic iron pipe in the vertical and horizontal directions. Is going on.
However, the assembly period of the scaffold is required, and the assembly cost is high. Further, since the inspector works on the high scaffold, careful attention is required for ensuring safety.
Therefore, in order to solve this problem, Patent Document 1 discloses a cart equipped with a plurality of wheels that self-travel while adsorbing to the inner surface of the hydraulic iron pipe, an odometer for measuring the traveling distance of the carriage, and a hydraulic iron pipe. Disclosed is a thickness measuring method using a thickness measuring device having an eddy current sensor used for measuring the thickness of a coating film formed on the inner surface of the steel and an ultrasonic sensor used for measuring the total thickness of a hydraulic iron pipe including the coating thickness. Has been.
This thickness measuring device is suitable for a device for measuring the thickness of a ground-type hydraulic iron pipe that can be easily approached by an inspector, and the inspector carries the thickness measuring device to a measurement location to measure the thickness of the hydraulic iron pipe. Measurement is performed automatically. Thereby, the thickness of a hydraulic iron pipe can be continuously measured from the outer surface side, without installing a scaffold. If there is an obstacle on the outer surface side of the hydraulic iron pipe and thickness measurement from the outer surface side is not possible, a thickness measuring device is inserted from the manhole provided in the hydraulic iron pipe, and the thickness of the hydraulic iron pipe is continuously increased from the inner surface side. Can be measured.

JP 2004-61213 A

However, hydraulic iron pipes include steeply inclined ground type iron pipes or buried type iron pipes in which an inspector cannot easily approach the outer surface side and cannot easily enter the inner surface side. In order to measure the thickness of such a hydraulic iron pipe at an arbitrary position, it is necessary to insert a thickness measuring device into the hydraulic iron pipe and move it by a long distance (for example, 200 mm or more) on the inner surface side by remote operation.
For this reason, when moving the thickness measuring apparatus like the invention of Patent Document 1 for a long distance, for example, the inner surface (thinning) state of the hydraulic iron pipe, the displacement of the traveling position of the thickness measuring apparatus, or measurement using each sensor Since the situation cannot be confirmed from the outside of the hydraulic iron pipe, the position accuracy of the measurement location may be deteriorated.
In addition, the signal from each sensor of the thickness measuring device is transmitted as an analog signal via a cable connecting the thickness measuring device main body and the outside of the hydraulic iron pipe, but when the cable length exceeds 50 m, Attenuation increases and measurement accuracy decreases.
Then, as shown in FIG. 8, the drop from the surge tank 90 that stores water to the water turbine 91 that generates power stops, for example, in the buried long-diameter hydraulic iron pipe 92 having a length of 200 m or more, and the thickness measuring device fails. In this case, when the above-described cable is wound up and the thickness measuring device is collected, for example, the frictional resistance of the cable at the elbow portion 93 of the hydraulic iron pipe 92, the cable weight increase with the length, and the inner surface of the hydraulic iron pipe 92 Due to the adsorption resistance of the magnets on the wheels, a great traction force is required for the collection of the thickness measuring device. For this reason, since there exists a possibility that a cable may cut | disconnect at the time of winding of a cable, it was necessary to enlarge a cable size or to enlarge a winding machine with the increase in the weight of a cable.
Further, when the thickness of the hydraulic iron pipe 92 is measured, the weight of the cable increases, so that the weight cannot be endured and the thickness measuring device adsorbed on the hydraulic iron pipe may fall.

The present invention has been made in view of such circumstances, and provides a method for measuring the thickness of a hydraulic iron pipe that is suitable for measuring the thickness of a hydraulic iron pipe having a long length and capable of measuring the thickness economically and safely. For the purpose.

The thickness measurement method of a hydraulic iron pipe according to the present invention that meets the above-mentioned object is used in a hydroelectric power station, and is self-propelled while adsorbing to the inner surface of a hydraulic iron pipe that is inclined downward or vertically from an upstream side to a downstream side. A wheel and a carriage provided with a drive motor coupled to the wheel via a clutch mechanism ; an eddy current sensor mounted on the carriage and used for measuring a coating thickness formed on the inner surface of the hydraulic iron pipe ; and Having an ultrasonic sensor used for measuring the total thickness of the hydraulic iron pipe including the coating thickness ,
The instrumentation part is configured to be separable from the carriage, and a power transmission from the outside of the hydraulic iron pipe to the instrumentation part, and a control device outside the hydraulic iron pipe and the instrument are provided on the rear side of the instrumentation part. A cable for performing signal communication with the mounting portion is connected, and a spiral protrusion is formed on the outer periphery of the cable to reduce frictional resistance when the cable is moved along the hydraulic iron pipe. Using a thickness measuring device, the method of measuring the thickness of the hydraulic iron pipe,
1) The carriage and the instrumentation part are separated and inserted upstream of the hydraulic iron pipe, the instrumentation part is placed on the carriage in the hydraulic iron pipe, the eddy current sensor, Attach an ultrasonic sensor and the cable to the instrumentation part,
2) Run the thickness measuring device in which the instrumentation unit is mounted on the carriage toward the downstream side, and determine the thickness of the hydraulic iron pipe using the eddy current sensor and the ultrasonic sensor,
3) When one or both of the cart and the instrumentation unit fails, the clutch mechanism is operated after a predetermined time, the wheel and the drive motor are disconnected, and the cable is disconnected. The thickness measuring device is returned to its original position by winding with a winder.
In the method for measuring a thickness of a hydraulic iron pipe according to the present invention, the length of the hydraulic iron pipe is preferably 100 m or more.

Since the thickness measuring method of the hydraulic iron pipe according to claim 1 or 2 measures the thickness of the hydraulic iron pipe while lowering the thickness measuring device, for example, the weight of the thickness measuring device becomes heavy or power is transmitted to the thickness measuring device. Even if the weight of the cable increases as the length of the cable is increased, the thickness of the hydraulic iron pipe can be measured while the thickness measuring device is lowered by its own weight without excessively increasing the driving force of the thickness measuring device. Can be implemented. Thus, it is possible to measure the thickness of a long hydraulic iron pipe economically and safely by a simple method.
And since the thickness measuring apparatus is provided with the clutch mechanism, in the event of a failure, the force that hinders the rotation of the wheel can be reduced by releasing the connection between the wheel and the drive motor. Thereby, for example, from the inside of a long hydraulic iron pipe, even when the thickness measuring device cannot return to its original position by itself, without excessively increasing the cable size or the capacity of the cable winder, By winding the cable from the outside of the hydraulic iron pipe, the thickness measuring device can be easily collected from the hydraulic iron pipe.
In addition, since the cable is provided with a protrusion on the outer periphery of the cable, even if the weight of the cable increases as the length increases, the friction resistance of the cable against the inner surface of the hydraulic iron pipe can be reduced. Can be smaller. Thereby, the increase in further frictional resistance accompanying the increase in the weight of the thickness measuring apparatus which carried various equipment and was enlarged can be suppressed.
In particular, since the thickness measuring method of the hydraulic iron pipe according to claim 2 measures the thickness of the hydraulic iron pipe having a length of 100 m or more, the above-described effect appears more remarkably.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a side view of a thickness measuring apparatus for a hydraulic iron pipe to which the thickness measuring method for a hydraulic iron pipe according to an embodiment of the present invention is applied , FIG. 2 is a front view of the thickness measuring apparatus for the hydraulic iron pipe, FIG. Is a rear view of the thickness measuring device of the hydraulic iron pipe, FIG. 4 is an explanatory diagram of a clutch mechanism of the thickness measuring device of the hydraulic iron pipe, and FIGS. 5A and 5B are cables of the thickness measuring device of the hydraulic iron pipe, respectively. Sectional drawing, side view, FIG. 6 is explanatory drawing which shows the use condition of the thickness measuring apparatus of the hydraulic iron pipe, FIG. 7 is explanatory drawing of the apparatus structure of the thickness measuring apparatus of the hydraulic iron pipe.

As shown in FIGS. 1 to 7, a hydraulic iron pipe thickness measuring device (hereinafter also simply referred to as a thickness measuring device) 10 to which a hydraulic iron pipe thickness measuring method according to an embodiment of the present invention is applied is a hydroelectric power plant. Is a device that can automatically measure the thickness of a hydraulic iron pipe 11 (for example, an inner diameter of 1000 mm or more and about 5000 mm or less) 11 without breaking the hydraulic iron pipe 11, and in particular, 100 m or more (here, about 200 m). This is a device suitable for measuring the thickness of the hydraulic iron pipe 11 having a length of This will be described in detail below.

As shown in FIGS. 1 to 3, the thickness measuring device 10 includes a carriage 14 having a plurality of wheels 13 that are self-propelled while adsorbing to the inner surface 12 of the hydraulic iron pipe 11.
Four wheels 13 are provided on each of the left and right sides of the carriage 14 so as to be rotatable in the front-rear direction (traveling direction). This wheel 13 is a magnet wheel (for example, a diameter of about 100 mm) coated with urethane rubber around it, and as shown in FIG. 13 is set as a set and can be driven by a DC drive motor 15 with one speed reducer. Thus, by using the four drive motors 15, it is possible to improve the drive force of the carriage 14 when the magnet is operated, and to adjust the output of each drive motor 15 individually (adjusting the rotation speed of the wheels) ), The traveling direction of the carriage 14 can be adjusted.
The plurality of wheels 13 are arranged in a C shape when viewed from the front, and are inclined (for example, about 1 to 10 degrees) with respect to the vertical direction of the carriage 14, so that the inner surface 12 of the hydraulic iron pipe 11. Thus, the contact area of the wheel 13 with respect to the inner surface 12 of the hydraulic iron pipe 11 can be improved.

As shown in FIG. 4, a clutch mechanism 17 is provided between a drive shaft 16 that drives a set of wheels 13 and a drive motor 15. FIG. 4 illustrates one side of the carriage 14.
The clutch mechanism 17 can be composed of a drive shaft gear provided on the drive shaft 16, a drive motor gear provided on the drive motor 15, and a gear meshing with the two gears. Here, by engaging the gears for the drive shaft and the drive motor, the drive shaft 16 and the drive motor 15 are connected, and the power of the drive motor 15 can be transmitted to the drive shaft 16 to rotate the wheel 13. . On the other hand, by removing the gear from the drive shaft gear and the drive motor gear, the connection between the drive shaft 16 and the drive motor 15 is released, and the rotation of the wheel 13 can be made free.
A rotary encoder (an example of an odometer) 18 is provided in the lower central portion of the carriage 14. The rotary encoder 18 is configured to be pressed against the inner surface 12 of the hydraulic iron pipe 11 with a predetermined force using a spring.
The detailed configuration of the carriage 14 excluding the clutch mechanism 17 can be the same as that described in, for example, Japanese Patent Application Laid-Open No. 2004-61213.

As shown in FIGS. 1 to 3, an instrumentation unit 19 is mounted on the carriage 14 so as to be attachable / detachable (separable).
The instrumentation unit 19 has a casing 20 placed on the carriage 14, a cleaning means 21 for cleaning the inner surface 12 of the hydraulic iron pipe 11 is provided on the lower front side of the casing 20, and an eddy current sensor on the lower rear side. 22 and a reflection type ultrasonic sensor 23 are provided.
The cleaning means 21 has a cleaning brush 24 that is rotatable about an axis that is arranged in parallel to the width direction of the thickness measuring device 10. In addition, a water supply pipe 25 is installed in front of the cleaning brush 24 obliquely upward and downward in parallel with the axis of the cleaning brush 24.
Thereby, water is sprayed to the inner surface 12 of the hydraulic iron pipe 11 through the plurality of jet outlets 26 that are attached at equal intervals along the longitudinal direction of the water supply pipe 25, and the cleaning brush 24 is rotated to rotate the inner surface of the hydraulic iron pipe 11. 12 can be washed.

The eddy current sensor 22 is a conventionally known one that is used for measuring the thickness of the coating film formed on the inner surface 12 of the hydraulic iron pipe 11. The signal (voltage) obtained from the eddy current sensor 22 is processed to obtain the coating film thickness. t can be obtained. The ultrasonic sensor 23 is a conventionally known one used for measuring the total thickness of the hydraulic iron pipe 11 including the coating film thickness t. The signal (waveform) obtained from the ultrasonic sensor 23 is processed, The total thickness S can be determined.
By subtracting the coating film thickness t from the total thickness S, the thickness T of the hydraulic iron pipe 11 can be obtained.
The detailed configuration of the cleaning means 21, the eddy current sensor 22, and the ultrasonic sensor 23 of the instrumentation unit 19 described above can be the same as that described in, for example, Japanese Patent Application Laid-Open No. 2004-61213.

Further, a front observation camera (CCD camera) 27 that images the front of the thickness measuring device 10 and a rear that images the rear of the thickness measuring device 10 are provided at the front upper end and the rear upper end of the casing 20 of the instrumentation unit 19. Observation cameras (CCD cameras) 28 are respectively installed.
The front observation camera 27 can swing in the left-right direction of the carriage 14 by an axis arranged in the vertical direction of the carriage 14, and can be moved with respect to the carriage 14 by an axis arranged in the horizontal direction of the carriage 14. The tilt angle can be adjusted. In addition, on both sides of the front observation camera 27, front illumination 29 composed of high-intensity LEDs is provided.
Thus, by adjusting the fixed position of the front illumination 29 with respect to the front observation camera 27, for example, the inner surface (thinning) situation of the hydraulic iron pipe 11 or the running situation of the thickness measuring device 10 even in the dark hydraulic iron pipe 11. Can be imaged.

Further, on both sides of the rear observation camera 28, rear illumination 30 composed of high-intensity LEDs is provided. The installation positions of the rear observation camera 28 and the rear illumination 30 are fixed, but the positions of the rear observation camera 28 and the rear illumination 30 can be adjusted in the same manner as the front observation camera 27 and the front illumination 29.
Thereby, even in the dark hydraulic iron pipe 11, for example, it is possible to image a traveling state when the thickness measuring device 10 travels backward or a state of the cable 31 that transmits power to the instrumentation unit 19 of the thickness measuring device 10 from the outside.
A sensor observation camera (CCD camera) 32 that captures the measurement status of the eddy current sensor 22 and the ultrasonic sensor 23 is installed on the rear side surface of the casing 20 of the instrumentation unit 19.
The sensor observation camera 32 is also provided with sensor illumination composed of high-intensity LEDs, and the measurement state by the eddy current sensor 22 and the ultrasonic sensor 23 can be imaged even in the dark hydraulic iron pipe 11.

The casing 20 is provided with a conventionally known angle sensor that detects the front / rear and left / right inclination of the carriage 14 when the carriage 14 travels. Thereby, for example, it is possible to easily grasp the position on the hydraulic iron pipe 11 where the carriage 14 is traveling and the traveling state of the carriage 14.
Further, on both sides of the casing 20, connection connectors 33 for connecting the drive motor 15 and the control cable of the clutch mechanism 17 are provided. Further, on the front side of the casing 20, a connector for connecting a water supply pipe to the water supply pipe 25 of the cleaning means 21, a control cable for the cleaning brush 24, a control cable for the front observation camera 27 and the front illumination 29. (Not shown) is provided. Further, on the rear side of the casing 20, a connection connector (not shown) for connecting a cable 31 for performing signal communication with the eddy current sensor 22 and the ultrasonic sensor 23, a control cable for the rear observation camera 28 and the rear illumination 30. Not).

As shown in FIGS. 5A and 5B, the cable 31 connected to the instrumentation unit 19 includes a stainless steel wire 34, a water tube 35, an optical fiber (an example of an optical cable unit) 36, a power supply line 37, and a communication line 38. The control cable 39 is a composite cable for transmitting power from the outside of the hydraulic iron pipe 11 to the instrumentation section 19, supplying water, and performing signal communication between the outside of the hydraulic iron pipe 11 and the instrumentation section 19. The length of the cable 31 is determined in accordance with the length of the hydraulic iron pipe 11, and considering the current length of the hydraulic iron pipe 11, for example, a length of about 100 m to 300 m (here, 200 m). And has a diameter of about 10 mm to 30 mm (here, 20 mm).
The outer peripheral portion of the cable 31 is covered with a material that is lightweight and tough and can reduce the frictional resistance with the hydraulic iron pipe 11, for example, polyamide. In addition, a core wire 40 is spirally wound around the outer circumference of the cable 31 in the longitudinal direction of the cable 31, and this is covered with polyamide, so that a protrusion 41 (for example, a protrusion height) is formed on the outer periphery of the cable 31. Is about 0.5 mm to about 2 mm, and the spiral period is about 50 mm to about 200 mm).
Thereby, since the cable 31 moves along the inner surface 12 of the hydraulic iron pipe 11 via the protrusion part 41, compared with the case where there is no protrusion part 41, the frictional resistance can be reduced to about 1/5 or less.

The stainless steel wire 34 arranged at the center of the cable 31 improves the tension of the cable 31, and has an outer diameter of about 1.5 mm to 3.5 mm (here, 2.4 mm). . Thereby, it can prevent that the cable 31 is cut | disconnected by the tension | tensile_strength which generate | occur | produces when pulling the cable 31 and collect | recovering the trolley | bogie 14. FIG.
Further, as shown in FIGS. 6 and 7, the cable 31 is connected to a control device (for example, a remote controller) 43 via a winder (an example of a winding means) 42 that winds the cable 31. A control device 43 is connected to a camera monitor 44 and a signal processing device (for example, a notebook personal computer) 45. The winder 42 is configured such that the sending speed or winding speed of the cable 31 can be operated in synchronization with the traveling speed (traveling position) of the carriage 14. Further, the winder 42 is provided with a slip ring and a swivel joint, and enables electrical connection with the cable 31 and supply of water when the cable 31 is sent out or taken up. The winder 42 is provided with an optical-LAN converter and an optical-video converter.

Thereby, water can be supplied from the water tank 47 to the water supply pipe 25 of the cleaning means 21 by the pump 46 via the water tube 35 in the cable 31.
Also, by using the optical fiber 36, analog signals from the eddy current sensor 22 and the ultrasonic sensor 23 can be converted into digital signals by the AD converter 49 mounted on the carriage 14, and transmitted while suppressing signal attenuation. . The signal transmitted through the optical fiber 36 is sent to the signal processing device 45 via the optical-LAN converter of the winder 42.
Signals from the rotary encoder 18 and the angle sensor can also be sent to the signal processing device 45.
Then, power can be transmitted from the generator 48 to the instrumentation unit 19 by the power line 37. Thereby, for example, the operation of the drive motor 15, the cleaning brush 24 of the cleaning means 21, the front observation camera 27, the rear observation camera 28, the sensor observation camera 32, the power supply and control board, and the AD converter 49 are operated. It becomes possible.
Further, the image signal captured by the front observation camera 27, the rear observation camera 28, and the sensor observation camera 32 is converted into a digital signal by the AD converter 49 by the communication line (for example, optical fiber) 38, and wound. It can be transmitted to the camera monitor 44 via the light-video converter of the machine 42.
Further, a command from the control device 43 can be transmitted to the instrumentation unit 19 through the control line 39.

As described above, the cable 31 enables power transmission from the outside of the hydraulic iron pipe 11 to the instrumentation unit 19 and signal communication between the outside of the hydraulic iron pipe 11 and the instrumentation part 19. The signal from the sound wave sensor 23 is taken in, and the measurement waveform can be displayed graphically on the display. Accordingly, by inputting the layout diagram of the hydraulic iron pipe 11 in advance in the signal processing device 45, for example, the position (distance) of the carriage 14 from the charging reference point, the traveling angle of the carriage 14, and the traveling angle can be displayed. Can be displayed graphically on top.
From the above, since the operator can check the situation in the hydraulic iron pipe 11 with the camera monitor 44 while continuously measuring the thickness of the hydraulic iron pipe 11 with the thickness measuring device 10, the thickness measurement is economical and It can be done safely.

Then, the thickness measuring method of the hydraulic iron pipe which concerns on one embodiment of this invention is demonstrated, referring above-described thickness measuring apparatus 10 and FIG. In addition, the hydraulic iron pipe 11 used as a measuring object is arrange | positioned perpendicularly | vertically from the upstream to the downstream (refer FIG. 8).
First, the carriage 14 and the instrumentation part 19 are separated and inserted into the hydraulic iron pipe 11, and the instrumentation part 19 is placed on and attached to the carriage 14 inside. At this time, the front observation camera 27, the rear observation camera 28, the sensor observation camera 32, the cleaning means 21, the eddy current sensor 22, the ultrasonic sensor 23, and the cable 31 are attached to the instrumentation unit 19. In addition, the shape of the hydraulic iron pipe 11 to be measured by the thickness measuring device 10 is input to the signal processing device 45 in advance.

And after arrange | positioning the thickness measuring apparatus 10 in the bottom face of the upstream side of the hydraulic iron pipe 11 to measure (within the range of ± 30 degree | times on the basis of the bottom position of the hydraulic iron pipe 11, for example), the rotary encoder 18 of the hydraulic iron pipe 11 is set. Confirm that the inner surface 12 is in contact. Then, the front illumination 29, the rear illumination 30, and the sensor illumination are turned on by the control device 43, and the imaging state of the front observation camera 27, the rear observation camera 28, and the sensor observation camera 32 is changed to a camera monitor. Confirm by 44. The front observation camera 27 adjusts its imaging position by the control device 43 and also adjusts the position of the front illumination 29.

After the above-described operations are sequentially performed and the thickness measurement device 10 is ready for measurement, the drive motor 15 is driven by the control device 43 and the wheel 13 is adsorbed to the inner surface 12 of the hydraulic iron tube 11 while downstream of the hydraulic iron tube 11. Travel toward the side (for example, about 10 m / min or less). At this time, the sending speed of the cable 31 from the winder 42 is also made substantially the same as the traveling speed of the carriage 14. Then, the cleaning means 21 is operated to clean the inner surface 12 of the hydraulic iron pipe 11, and the thickness of the hydraulic iron pipe 11 continuously washed by the signal processing device 45 is measured using the eddy current sensor 22 and the ultrasonic sensor 23. Ask. This measurement position is obtained by the rotary encoder 18. Further, the traveling direction of the thickness measuring device 10 can be confirmed on the display of the signal processing device 45 by a signal from the angle sensor.
In this way, when the thickness of the hydraulic iron pipe 11 is continuously measured, if the traveling direction of the thickness measuring device 10 deviates from a preset position, the output of each drive motor 15 is individually controlled by the control device 43. It adjusts and the rotation speed of the wheel 13 is adjusted, and the advancing direction of the thickness measuring apparatus 10 is corrected to a correct position.

As this method, for example, when the thickness measuring apparatus 10 moves to the left side of the setting direction, the rotational speed of the left wheel 13 is made faster than the right wheel 13. Further, when the thickness measuring device 10 is moving to the right side of the setting direction, the rotational speed of the right wheel 13 is made faster than the left wheel 13.
Thereby, the advancing direction of the thickness measuring apparatus 10 can be corrected to a correct position.
Thus, after the thickness measurement of the hydraulic iron pipe 11 is completed, the control device 43 reversely rotates the wheel 13 of the thickness measurement device 11, winds up the cable 31 with the winder 42, and uses the rear observation camera 28. While confirming the retracted state and the state of the cable 31 (for example, the occurrence of slack), it is caused to self-run to the original position.

Note that when one or both of the carriage 14 and the instrumentation unit 19 fails during the movement of the thickness measuring apparatus 10, the connection state between the wheel 13 and the drive motor 15 is released by the clutch mechanism 17.
For example, when the forward observation camera 27 is out of order, if the power transmission to the instrumentation unit 19 can be performed normally, the DC motor that operates the clutch mechanism 17 using the generator 48 is operated, and the wheel 13 and the drive motor 15 are operated. Release the connection status with. When this power transmission cannot be performed, the DC motor is operated using a battery (internal battery) loaded on the instrumentation unit 19 to release the connection state between the wheel 13 and the drive motor 15. At this time, the DC motor is operated after a predetermined time (for example, about 1 hour), so that the connection state between the wheel 13 and the drive motor 15 is not suddenly released.
As described above, after the connection state between the wheel 13 and the drive motor 15 is released, the cable 31 is wound up and collected by the winder 42 to return the carriage 13 to the original position.

From the instrumentation part 19 of the thickness measuring apparatus 10 returned to the original position, the front observation camera 27, the rear observation camera 28, the sensor observation camera 32, the cleaning means 21, the eddy current sensor 22, the ultrasonic sensor 23, and the cable After removing 31 and separating the instrumentation part 19 from the carriage 13, these are taken out from the hydraulic iron pipe 11.
Thus, the thickness measuring apparatus 10 of the present invention is suitable for measuring the thickness of the hydraulic iron pipe 11 having a long length, and can measure the thickness economically and safely.

As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. Other embodiments and modifications conceivable within the scope of the above are also included. For example, the case where the thickness measuring method for a hydraulic iron pipe of the present invention is configured by combining some or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
Moreover, in the said embodiment, although the thickness of the hydraulic iron pipe arrange | positioned perpendicularly | vertically from the upstream to the downstream was measured using the thickness measuring apparatus, it went downward from the upstream to the downstream. It is also possible to measure the thickness of the inclined hydraulic iron pipe.
And in the said embodiment, although the case where the helical protrusion part was continuously provided around the cable was demonstrated, for example, a helical protrusion part is provided intermittently over the longitudinal direction of the cable. It is also possible to provide a large number of small protrusions (for example, about 5 mm or less) having a circular cross section or an elliptical cross section around the cable.

It is a side view of the thickness measuring apparatus of the hydraulic iron pipe which applied the thickness measuring method of the hydraulic iron pipe concerning one embodiment of the present invention. It is a front view of the thickness measuring apparatus of the hydraulic iron pipe. It is a rear view of the thickness measuring apparatus of the hydraulic iron pipe. It is explanatory drawing of the clutch mechanism of the thickness measuring apparatus of the hydraulic iron pipe. (A), (B) is sectional drawing and the side view of the cable of the thickness measuring apparatus of the hydraulic iron pipe, respectively. It is explanatory drawing which shows the use condition of the thickness measuring apparatus of the hydraulic iron pipe. It is explanatory drawing of the apparatus structure of the thickness measuring apparatus of the hydraulic iron pipe. It is explanatory drawing of a hydroelectric power generation facility.

10: Hydraulic iron pipe thickness measuring device, 11: Hydraulic iron pipe, 12: Inner surface, 13: Wheel, 14: Carriage, 15: Drive motor, 16: Drive shaft, 17: Clutch mechanism, 18: Rotary encoder (odometer) , 19: instrumentation part, 20: casing, 21: cleaning means, 22: eddy current sensor, 23: ultrasonic sensor, 24: cleaning brush, 25: water supply pipe, 26: spout, 27: camera for front observation, 28 : Rear observation camera, 29: front illumination, 30: rear illumination, 31: cable, 32: sensor observation camera, 33: connection connector, 34: stainless steel wire, 35: water tube, 36: optical fiber (optical cable part) ), 37: power line, 38: communication line, 39: control line, 40: core wire, 41: protrusion, 42: winder (winding means), 43: control device, 44: camera module Ter, 45: signal processing device, 46: Pump, 47: water tank, 48: generator, 49: AD converter

Claims (2)

A plurality of wheels that are used in a hydroelectric power station and are self-propelled while adsorbing to the inner surface of a hydraulic iron pipe that is inclined downward or vertically from the upstream side to the downstream side, and a drive motor connected to the wheels via a clutch mechanism A trolley sensor mounted on the carriage and used for measuring the thickness of the coating film formed on the inner surface of the hydraulic iron pipe , and used for measuring the total thickness of the hydraulic iron pipe including the coating thickness. An instrumentation unit equipped with an ultrasonic sensor ,
The instrumentation part is configured to be separable from the carriage, and a power transmission from the outside of the hydraulic iron pipe to the instrumentation part, and a control device outside the hydraulic iron pipe and the instrument are provided on the rear side of the instrumentation part. A cable for performing signal communication with the mounting portion is connected, and a spiral protrusion is formed on the outer periphery of the cable to reduce frictional resistance when the cable is moved along the hydraulic iron pipe. Using a thickness measuring device, the method of measuring the thickness of the hydraulic iron pipe,
1) The carriage and the instrumentation part are separated and inserted upstream of the hydraulic iron pipe, the instrumentation part is placed on the carriage in the hydraulic iron pipe, the eddy current sensor, Attach an ultrasonic sensor and the cable to the instrumentation part,
2) Run the thickness measuring device in which the instrumentation unit is mounted on the carriage toward the downstream side, and determine the thickness of the hydraulic iron pipe using the eddy current sensor and the ultrasonic sensor,
3) When one or both of the cart and the instrumentation unit fails, the clutch mechanism is operated after a predetermined time, the wheel and the drive motor are disconnected, and the cable is disconnected. A method for measuring the thickness of a hydraulic iron pipe , wherein the thickness measuring device is returned to its original position by being wound by a winder . 2. The method for measuring the thickness of a hydraulic iron pipe according to claim 1 , wherein the length of the hydraulic iron pipe is 100 m or more.

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